Focusrite Scarlett 18i8 USB-C Audio/MIDI Interface (3rd Generation) - Manual (Page 18)

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Connecting Scarlett 18i8 to loudspeakers
The 1/4” LINE OUTPUTS 1 and 2 jacks on the rear panel will normally be used to send audio to
monitoring speakers. Self-powered monitors incorporate internal amplifiers with a volume control,
and may be connected directly. Passive loudspeakers will require a separate stereo amplifier; in this
case, the rear panel outputs should be connected to the amplifier’s inputs.
All the line output connectors are 3-pole (TRS) ¼” (6.35 mm) jack sockets, and are electronically
balanced. Typical consumer (hi-fi) amplifiers and small powered monitors will probably have
unbalanced inputs, either on phono (RCA) sockets, or via a 3.5 mm 3-pole jack plug intended for
direct connection to a computer. In either case, use a suitable connecting cable with jack plugs at
one end.
Professional active monitors and professional power amplifiers will generally have balanced inputs.
LINE OUTPUTS 1 to 4 incorporate “anti-thump” circuitry that protects your speakers if the Scarlett
18i8 is turned on while the speakers (and amplifier if used) are connected and active.
Active Speakers